Accessing Plex Plugin Folder On System Disk

I found an audiobook plugin that I'm wanting to install on Plex but I'm not sure how to access the Plex folder on the system disk. Is there a fairly easy way to access the system disk from Windows to make changes or am I s.o.l.?

You probably want to use Putty to SSH into your OMV system and then navigate to through your filesystem using the CLI, or maybe install midnight commander on your server and use that to move files around. You probably don't want to share your root filesystem with Samba or something.